I'm testing its functionality I have a trans_volumec layer on top of another layer that also changes colour and the only real way to see it is to lower the volume to see it change. Plus there is still the issue with the horizontal hue slider (unless that's been fixed since 1.54?)

something else i noticed about the knobs -- if you take the knob past 0 or 100% and continue mouse travel beyond, once you reverse direction you have to go back the full distance to start moving the knob in the other direction. optimally, the knob should start to reverse direction immediately once the mouse has reversed direction, not waiting until the cursor has returned to the original position.